Improvement in machines for dressing millstones



2 shew-sheet 1.`

P. lI-IAAS. Machine for Dressing Millsstones- I v Patented Jan. 21, 1879.

N.PETERS. FHOTmuTl-IOGRAPMER. WASHINGTDN. D C.

P. M. HAAS. y Machine for Dressing Millstones. No. 211,567.

Patented. 1an. 21,1879..

yNPETERS. PHOb-LITMOGRAPHER, WASHINGTON. n C.

\ Warren, in the county l Millstones,

Vcircumference of the stone.

PATENT OEEIcE.

PHILIP M. HAAS, OF WARREN, OHIO,

ASSIGNOR OFA ONE-HALF HIS RIGHT TO DAVID DANIEL LUCAS, OF SAME PLAGE.

IMPROVEMENT IN MACHINES FOR DRESSING MILLSTONES.

Specification forming part of Letters Patent No. 211,567, dated January 21, 1879; application filed November 26, 1878.

To all whom 'it may concern:

Be it known that I, PHILIP M. HAAS, of of Trumbull and State of Ohio, have invented certain new and useful Improvements in Machines for Dressing of which the following` is a specification:

My improved machine is designed for dressing millstones with a diamond or carbon point.

A distinguishing feature of my invention consists in the construction and adaptation of ythe machine for operation and adjustment independent of any support by the stone or the spindle to effect a true facing anda true dress- 1n 0.

circular anged rim of greater diameter than the stone supports the operating parts of the machine,

by which the machine is adjusted true to the face of the stone and arrau ged concentric theretical pivot arranged at or near the circumference of the revoluble frame and outside of the The carriage which carries the diamond-holdin g device is mounted upon this pivoted frame, the adjust- `ment of which will present the diamond so as -to conform to the furrows or lands, as required.

This adjustment is made bymovin g and clamping the inner end of said oblong frame upon a conforming guideway of the revoluble frame.

In the operation of dressing the entire face of the stone, the base guide-rim remains fixed, and therevoluble frame is turned a full revolution, first, to determine, by means of a marker or quill, the true adjustment of the machine in relation to the face of the stone,vand then turned, as may be required, in connection with the adjustment of the pivoted frame, to con- 'form the diamond to the draft or direction of .the furrows or lands. The range of movement of the inner end of the pivoted frame upon its swivelin g pivot is equal on both sides of a radial line, and sufcient to adapt it for workin dressing stones running either to the right or and is mounted, by set-screws, upon corresponding 1ron pins fixed 1n the iioor,

to the left. A vertical head-block supports the inner end of this frame, and serves to clamp it when adjusted upon the curved guideway of the revoluble frame. This pivoted frame is hung upon trunnions arranged in the head-block and in the swivelin g pivot-head, whereby it is inclined to either side to adapt the diamond for furrowing` a right or left millstone.

The diamond-carrying slide is adjusted automatically to suit the required width of the furrow, and by hand to suit thedistance between the furrows, and the feed of the diamond is made to suit either a right or left dressed millstone.

The machine is adapted, by its novel construction and capacity for adjustment, to produce any kind of dress which may be desired, and in this particularit is highly advantageous.

Referring to the drawings, Figure l represents a top view of my improved machine for dressing millstones; Fig. 2, a vertical section taken lengthwise through the pivoted frame; Fig. 3, a side view of said frame, showing the device for feeding the diamond in relation to the width of the furrow; Fig. 4, a cross-section o`f the pivoted frame, showing the manner of clamping its head-block to the curved guideway of the revoluble frame, and Fig. 5, an enlarged view of the swiveling pivot.

A circular metallic flanged rim, A, forms the base of the machine and has three or more equally-disposed set-screws, B, passing vertically through enlarged parts of the horizontal iiange of said rim, and which it into corresponding socket-pins (l in the iloor, by which to adjust the flanged base true with the face of the stone before commencing the operation of forming the furrows. This flanged base is of greater diameter than the stone, and when set upon the pins is concentric with the stone.

This construction adapts the machine for operation and adjustment independent of the stone, and in this particular is important in effecting the true adjustment of the machine i with the stone and of maintaining suoli adjustment during the operation of dressing.A

A horizontal revoluble metallic frame, D, is iitted and supported by three or more lapbearings, D', upon the vertical base-rim, so as to receive the mill-spindle.

to be centered and turned thereon within and against the inner wall of said rim. I preferd to have this frame open, with curved bracing, as shown; but it may be made in any suitable way that will give a bearing upon and within the rim. 1t has a central opening, a, At one side of the center, and upon the top of this frame, I arrange a horizontal oblong frame, E, which carries the diainend holding and feeding de- Nices, and which is pivoted and supported at its outer end by a swiveling screw, b, secured in a boss, c, on the inner side of the rim of the revoluble frame, while the inner end of this frame E is supported by means of a horizontal trunnion, d, fitted in a vertical headblock, I, which, by means of a shouldered seat, e, and a foot-extension, c', rests upon the top and against the concave side of a segmental guideway, D2, which joins the curved bracing, and a segmental rim, D3, which support vthe swiveling-screw bearing-boss. This guideway D2 is concentric with the swiveling screw b, is less than a seinicircle, and upon it thc pivoted fame .E is supported and adjusted as may be required, in connection with the revoluble frame, to bring the diamond in position to do its work. In such adjustment the inner end of this frame is turned on either sidei of a radial line, as required.

By this construction and arran gement of frame, adjustable from a single point outside of the circumference of the stone, in connection with the revoluble frame, the furrows can be formed without being confined to a specific dress.

When the pivoted frame is set for work, it is clamped in place by means of a clamp-screw, Gr, passing downward through the head-block, with a head, f, on its lower end, overlapping the under side of the segmental guideway'DZ,

and a thumb-nut, g, on its Lipper end, bearing upon the head-block, so that by this thumbnut and clamp-screw the head-block can be clamped and unelaniped, as may be required during the work.

The swiveling screw 1)while serving the function stated, serves also, by having a head, h, as the bearing for a truiinion, d', on the outer end of the pivoted frame, and, coincident with the head-block trunnion d, to allow the frame to be turned on thcsetrunnions to ineline it either to the right or left, to suit the furrowin g of a right or left millstoiie.

A gage, j, on the top of the headblock serves to determine the degree of side inclination of this frame, while a screw, 7c, projecting from a vertical arm, l, at the inner end of the pivoted frame, through a segmental slot, m, in the upper part of the head-block, serves, by means of a nut, u, to clamp the frame in whatever position it may be desired to incline or operatethe diamond.

The diamond carrying and feeding devices are arranged upon a carriage, H, fitted within longitudinal side ways or guides r of the pivoted frame. A slide, I, fitted in cross ways or guides on this carriage, supports and carries the diamond-holdin g stem J, which is secured to a tubular carrier, K, fitted within a sleeve, L, projecting downward from the slide. The tubular carrier is adjusted vertically with its diamond by a thuinb-screw, M, secured in a bracket, N, on the slide, and fitting a socketk screw in the upper end of the tubular carrier K, while the lateral adjustment and feed of the diamond is made by a feedserew, l?, secured in a bracket, Q, on the carriage H, and screwing into an arm, N', on the slide.

The carriage is operated to carry the diamond back and forth by a handle, O, and the feed of the diamond to suit the width of the furrow is effected automatically by a tripping rocker-bar, R, mounted loosely upon the stein of the feed-screw P, and carrying a double pawl, S, adapted to engagewith a spur-pinion, T, fixed on the feed-screw stem, so that as the bar R is rocked or vibrated with the pawl the latter turns the spur-pinion and its screw l) and feeds the diamondcarrying slide.

The bar is rocked to turn the pinion and feed-screw by its lower end comin g in contact with aprojection, s, on the side of the pivoted frame as the carriage is moved forward. The bar is tripped 'over the projection and returned to its normal vertical position by a spring, t, fixed to said bar and to the bracket Q, and in which the pawl passes over the pinion-teeth without turning it. The side projection s has a slotted part, s', which lits into a guideseat in a carrier, u, by which said projectioncan be adjusted vertically to give the bar `more or less movement, and thereby regulate the lateral feed of the diamond. The Iprojection and the foot ofthe rock-bar are beveled or rounded, to allow of the proper tripping action. The double pawl can be adjusted to engage with the pinion for a right or left dress, and in such adjustment it is held by a spring, v, which is also adapted to hold said pawl out of action when the diamond is shifted by hand by the crank-handle U on the feed-screw.

The carrier u for the tripping feed vprojec,A tion serves, also, as the means of carryingthe marker or quill fu', which isinserted in a socket, e2, for determining the true horizontal adjustment of the stone. This carrier u for this purpose is fitted, by top and bottom angle-lips, into corresponding grooves w, Figs. 4 and 5,iii the side bar ofthe pivoted frame, so that it can be moved along the length of said frame toward the center ofthe stone, and thus test the level of the latter at different points in relation to the plane of the flanged adjusting base as the revoluble frame is turned around over vthe stone. When this adjustment is determined, the carrier is fixed by a screw, in proper position to effect the feet of the diamond.

The adjustment of the diamond for causing it to cut the furrows deeper toward the center of the stone is effected bv adjusting the swiveling screw b vertically, said screw passing through a thimble, y, Fig.-5, seated in the boss projection c on the inner side of the-reA voluble frame. This thimble is slightly longer than theboss-proj ection, and lock-nuts z z upon the pivot-screw bear'upon .the top and bottom of the thimble, so that the nuts, thinible, and pivot turn together as the pivoted frameis turned upon its segmental guideway, and the outer end of the pivoted frame is raised and lowered, as may be required, to vary the longitudinal depth of the furrow by adjusting said nuts upon the swiveling screw. By this thimble-bearin g the nuts are held to their adjustment when made, and the swiveling screw bound secure in its seat.

By this construction it will be seen that the pivoted frame has three separate and distinct adjustments upon the revoluble frame, and these adjustments, together with that of the iian ged base, are all independent of the stone, which gives important advantages in holding the diamond, when set, properly and rigidly to its work, and prevent it from riding over hard spots in the stone yand cutting deeper into soft spots.

From the foregoing description it will be seen that the face of the stone is dressed from the independent base-guide rim as a gage;

and if the rim be true, the stone must necessarily have a true face, and thus dispense with staffing the stone, which is a very difficult and nice matter to do properly. This facingis to take olf the high points and make theV surface true. If the face of the stone is in wind the varia-tion' must be averaged by the proper adjustments of the base-rim, and the pivoted frame set level. The revoluble frame is then turned as each land is dressed until the face of the stone has been traversed in the same manner as in furrowing the stone. In facing the stone the feed of the revoluble frame must be so slight that the tool will take off all the raised points, and the pivoted frame for this purpose must be adjusted horizontally by the swiveling screw and nuts, so that the tool will not be raised or lowered.

In cracking the face of the stone the feed must be changed so that the cracks will be from a sixteenth to an eighth of an inch apart. This cracking is to take off the gloss that gets on the face ofthe stone.

The machine will face, crack, and furrow with the same tool and wholly independent of the stone as a support for the device, and by means of the co-operating adjustments of thc revoluble and pivoted frames, each time a fur-- row is cut, any kind of dress can be made.

1. In amillstone-dresser, the circular iia-n ged guide base-rim ,provided with adj ustin g-screws, and upon which the operating parts are adjustably mounted, in combination with iioorstud supports, whereby the machine is adapted for adjustment and use independent of the stone as a support therefor.

2. The combination, with the adjustable mounted by a pivot at its outer end upon -al swiveling screw to the .rim of the revoluble frame, and at its inner end by a pivot to a head-block, arranged and supported for adjustment in the arc of a circle upon a segmental guideway of the revoluble frame, for adjustment and operation on either side of a radial line of said frame in making either a right or left dress.

4. The adjustable head-block F, carrying the inner trunnion of the pivoted frame E, and having a slot, m, and clamp-screw 7c, for

adjusting said frame at a crosswise angle, in

combination with the clamp-screw Gr and the segmental guideway D2 of the revoluble frame, whereby both the pivoted frame and its headblock are clamped when properly adjusted for use.

5. The combination, with the pivoted frame E and its horizontally-adjustable head-block, of the swiveling adjusting-screw b, its bossthimble c, and thc adjusting lock-nuts zz', for the purpose stated.

6. The combination, with the pivoted carriage E, of the vertically-adjustable feed-tripping arm s s and its horizontally-adjustable carrier u, having also the marking-pencil holder c2, all arranged and adapted for use as described.

7. A millstone dresser and facer consisting vof the adjusting anged guide base-rim,

mounted upon iioor-studs independent of the stone, a revoluble frame mounted upon said guide base-rim, a pivoted frame mounted upon said revoluble frame for adjustment with its head-block in the arc of a circle at its inner end, and the tool-carrying and feeding devices mounted upon said pivoted frame, the severa-l parts being adapted for operation substantially as described. y

S. In a millstone-dress, a pivoted frame carrying the tool-operating devices, and having an adjustable swiveling connection outside of the diameter of the stone and an adjustment upon a segmental guideway at its end, near the center ofthe stone, and adapted for operation on either side of a radial line from said center, to produce any desired dress.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

PHILIP M. IIAAS.

Witnesses:

W. A. REEVES, D. D. LUcAs. 

